Extreme disasters costing more but killing fewer

Enlarge / Hurricane damage in Puerto Rico. (credit: Yuisa Rios/FEMA)

With the warming climate, we should expect a change in weather-related disasters. Fewer cold snaps and stronger heat waves are the obvious issues. But we should also see more intense storms, as a warmer atmosphere can hold more water vapor, while droughts may intensify in areas where rain was already sparse as the heat bakes water out of the soil.

All that suggests the costs of weather disasters will be different-but not necessarily better or worse. Researchers who have tried to study the topic have come up with very mixed results: some show an upward trend in the cost of natural disasters, while others fiercely dispute these analyses. Now, a new study suggests a possible reason for this: while the average damage caused by disasters is staying relatively stable, the most extreme events are increasing rapidly. But in a small bit of consolation, the human costs may be dropping.

A confused literature

It might seem that analyzing the cost of weather disasters would be simple: identify the disasters, total the cost, and see if there's a trend over time in the warming world. But the reality is more complex. One complication is obvious: offsetting effects. Heat waves are going up in a warming world, but cold snaps are dropping. If these changes have offsetting costs, you could see no effect even as the dynamics shift.

Read 13 remaining paragraphs | Comments